Adjustable scraper for roller-mills



J. HARVEY. I ADJUSTABLE SOBAPBR FOR ROLLER MILLS.-

(No Model.)

Patented-June 3, 1890,

//v VENTOI? W/ TN E SSE 8 NITED STATES ATENr FFICE.

JOHN HARVEY, OF BROOKLYN, NEW YORK.

ADJUSTABLE SCRAPER FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 429,381, dated June 3,1890.

Application filed March 22, 1890.

To all whom it may concern.-

Be it known that I, JOHN HARVEY, of Brooklyn, in the county of Kings andState of New York, have invented a new and useful Adjustable Scraper forRoller-Mills, of which the following is a full, clear, and exactdescription.

This invention relates to improved means for the removal of crushedgrain from the rolls of a roller-process mill used to disintegrate grainand reduce it to flour.

In the manufacture of flour from grain by the roller process it isessential that the crushed material should be continuously removed fromthe rolls; otherwise the accumulation of the same on the surface of thecontiguous rolls will become solidified and embedded in the surface ofsaid rolls, causing injury thereto. Y

The objects of my invention are to provide a roll-scraping device forroller-mills which is of simple form, adjustable and non-abrasive incontact, thorough in operation, and that avoids all danger of fire fromits action on the rolls.

To these ends my invention consists in certain features of constructionand combination of parts,which are hereinafter described, and indicatedin the claims.

Reference is to be made to the accompanying drawings, forminga portionof this specification, in which similar letters of reference indicatecorresponding parts in all of the figures.

Figure 1 is a side elevation of one roll of a roller-mill revolublymounted on the upper portions of side frames of the crushing-mill,

the improved roll-scraper being shown in positi on below the roll incontact therewith. Fig. 2 is a transverse elevation in section of aseries of three rolls in operating position upon Serial No. 344,907. (Nomodel.)

scraper-frame is proportioned to the width of the frame oftheroller-mill,between the sides A of which said scraper-frame isintroduced at right angles, so that its end portions willbe close to theinner faces of these sides. At each end of the scraper-frame ears 0 areintegrall y and oppositely projected, having their outer faces alignedwith the ends of the vertical flange b and base-plate a, these 'earsbeing re-enforced on their inner faces by abutting ears 0, formed onextensions of the free edge of the base-plate, a, on which edgeprojections of the base-plate other ears cl, nearer the longitudinalcenter of the scraper-frame, are formed integrally. The cars cat theends of the frame are perforated laterally and are screw-threaded forreception of set-screw bolts e, which by their adjustment longitudinallywill secure the frame between the sides of the roller-mill. Threadedholes are made in the ears d for the introduction of set-screw bolts f,the use of which will appear. A wooden clamping-strip O isprovided,which is of such relative form as to fit loosely between thevertical flange b and the parallel ears d, said strip having a rabbetedrecess formed on the face that is adjacent to the flange b, which recessis of a suitable depth vertically and laterally considered to admit astrip of leather D or other proper material of like nature. The leatherpiece D is designed to afford a scraperedge; hence it is made to projecta short distance above the clamping-strip O and vertical metal flange b,the thickness of the leather piece slightly exceeding the lateral depthof the rabbet-recess in which it is seated,so that it may be firmlyclamped between the piece 0 and flange opposite when the set-screw boltsf are properly adjusted. To prevent the embedding of the set-screw boltsf into the wooden strip 0, washer-plates 9 (shown in Fig. 2) areintroduced to receive the end-thrust of the bolts and distribute theirimpact over a larger surface on the clamping-strip.

The metal rolls E, that are of the usual approved construction, areadapted to revolve in contact, or nearly so, for the crushing of wheator other grain. These, being made to rotate with proper speed towardeach other in pairs, are supplied with grain on top and crush it bytheir revolution in the usual way. The movement of the rolls is not afeature of this invention; hence it is not necessary to show the meansfor efiecting the same.

Below each roll, at any preferred point for contact, the scraper-frameis adjusted to 10- 5 cate the upper edge of the scraper-strip in closecontact with the periphery of the cylindrical roll, so that thebearing-edges of all the scrapers will remove the adhering crushedmaterialfrom the roll-faces and keep them 10 clean.

While it is feasible to employ hard"- rubber and compressed paperboardfroinwhieh to manufacture the scraper-strips D, preference is given togood hard rolled leather for the I 5 purpose, which, if properlyprepared and adjusted,will Wear well and afford good results, all dangerof fire or abrasion of the rolls being obviated.

\Vhen the scraper-strips D are worn on the 20 edges, they can beelevated by an adjustment of the set-screw bolts h,'which engagethreaded holes in the base-plate a near the ends and bear uponwasher-plates g, set into the strip, and if necessary to raise theleather strips 25 from their seat in the clamping-piece 0, this can bedone by insertion between them of a liner of any suitable material, asshown at 2 in Fig. 2.

Having thus described my invention, I

claim as new and desire to secure by Letters 0 Patent 1. A scraper for aroll of a roller grain-crush ing mill, comprised of a metal frame, anonmetallicelampingstriplaterallyandvertically adjustable, and anon-metallic scraper-strip 5 clamped between the clamping-strip and anintegral metal flange on the f rame,the scrap erstrip being seated 011the clamping-strip and adjustable with it, substantially as set forth.

2. In a scraper for a roll of a grain-crush- 4o ing roller-mill, thecombination,with an elongated metal frame comprised of a base-plate andvertical flange integral with the bascplate, set-screws adapted to holdthe frame in position below a roll it is to scrape, and a 5 woodenclamping-strip rabbeted to form a seat for a non -metallicscraper-strip, of a leather or other non-metallic scraper-strip seatedon the clamping-strip, set-screw bolts which bear against theclamping-strip to ele- 5o vate it, and other set-screw bolts which areadapted to adjust the clamping-strips laterally, substantially as setforth.

JOHN HARVEY. WVitnesses:

WM. P. PATTON, O. SEDGWICK.

